There is nothing Apple can do to preserve their Chinese user's privacy against their own government. Either they stay in China and allow the government to access their citizen's data, or they leave China and another phone manufacturer will allow the government to access their citizen's data.
Google on the other hand is under no such pressure to violate their user's privacy. They could stop at any time, but have decided that the increased revenue and margins they can extract from the data is more valuable than their user's privacy.
This seems so obvious to me, I don't understand why this false equivalence is brought up so often.